Dentists who are certified to undertaken Invisalign should be more than competent to do the treatment for you. You are more than welcome to wait but the price may not come down. The cost of treatment is very much dependent on the complexity of tooth movement required. £4000 does not sound excessive for a moderate Invisalign case.
If you have concerns you should speak to your dentist or view the Invisalign website which will also tell you of all the Invisalign practices in the UK.
I hope this helps
Kindest regards
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